Continuous reading gauge



Jun@ 3U, 1925.

H. M. ROCKWELL CONTINUOUS READING GAUGE Filed June 7, 1920 Patented June30, 1925.

UNITED STATES 1,543,795 PATENT OFFICE.

HUGH M. ROC'KWELL, 0F BRISTOL, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO STANDARD STEEL AND BEARINGS INCORPORATED, OF WILMINGTON,DELAWARE, A CORPORATION OF DELAWARE.

CONTINUOUS READING GAUGE.

Application led June 7,

To all whom t may concer/n.:

Be it known that I, HUGH M. RUCKWELL, a citizen of the United States,and a resident of Bristol, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inContinuous Reading Gauges, of which the following is a specification,

My invention relates to measuring instruments, and more particularl todevices for indicating the vdimensions o an article during the period inwhich the article is being operated upon by a reducing tool. Such adevice is of particular utility during the operation of grinding therace members of an anti-friction bearing. l

Certain articles of manufacture, such, for example, as anti-frictionbearings, depend upon the accuracy of their manufacture for theirefliciency and durability. The race members of anti-friction bearingscannot vary over ive-thousandths of an inch from a given standard andsatisfactorily serve the purpose for which they are intended. To obtainthe necessary exactness of manufacture, careful grinding ofthe racemembers is imperative. To determine when the di-I mensions of the raceswere correct, it has heretofore been customary to stop operation uponthe work and appl thereto a suitable measuring instrument, a was removedor operations thereon resumed according to the condition of the work.This method of gauging did not produce uniform pieces of work, therebeing quite a ercentage of waste due to excessive grinding, andcontributed quite materially to the labor cost of the bearing, due tothe time consumed in the gauging of the work.

It is the obiect of my invention to provide a gauge, a contact member ofwhich will engage the surface operated upon during the period of oeration upon the work, and by means of w ich it may be determined whenthe work being operated upon has attained the desired dimension.

A further object of this invention is to provide a device of thischaracter which is simple in construction and eicient in its operation.

To accomplish the objects of this invention, I provide two or morecontact members, referably diamond chips, on arms or the. li e, soarranged that the contact mem-'- er which the work 192. Serial N0.387,180.

bers may be swung into or out of engagement with the work while it isbeing operated upon. One of the contact-carryin arms is pivotallymounted upon a standar in such a way that when the contact engages thework, the axis of the arm is substantially parallel to the axis ofrotation of the work, the standard itself, being mounted, preferably onthe machine in which the work is vbeing operated upon, for rotationabout an axis also substantially arallel to the axis of rotation of thework ut spaced from the axes of rotation both of the work and thecontact-carrying arm. A second contact-carrying arm is pivotally mountedon the first contact-carrymg arm and is arranged with its axis parallelto the axis of the first arm. Resilient means are provided to keep thecontacts in engagement with the work. An indicator mounted on the r'starm is arranged to be operated by the second arm to indicate thecondition of the work being reduced.

Other objects of the invention will be apparent from a reading of thefollowing specification and the appended claims.

Referrin now to the drawings, wherein is disclose an embodiment of theinvention,

Fig. 1 is a side elevation;

Fig. 2 is an end elevation.

For the purpose of illustrating the use and operation of one embodimentof the gauge, I have disclosed it as utilized to measure the diameter ofa ball groove in the inner race member of a ball bearing. It is notlimited to such wherever it is desirable to gauge or measure work whilebeing operated upon.

In Fi 1, 1 is ,the work being reduced to size, an 2 is the reducing toolor grinding wheel. A ost or other su port 3 is attached to t e machineor ot erwise maintained in proper position. Rotatably mounted on thepost 3 with its axisvof rotation parallel to the axis of the work andheld against movement axially thereof by the set screw 4, is thestandard 5 comprising an arcuate body portion, the outer end 6 of whichis arallel to the post 3. A Y. oke 7 is carriedrb the end 6 of the stanard, and between t e legs' 8 of the yoke is pivotally or rotatablymounted one end 4of the primary arm 9, in the free end of which is usebut may be utilized yso v located a contact 10. A pin 11 extends fromthe primar arm 9 on which 1s ad3ustabl mounted a `bracket 12, oneportion of whic is provided with the spaced lugs 13. The secondary arm14 is journalled on a shaft supported by the lugs 13. One end of thesecondary arm engages a contact 15 while the other end engages theplunger 16 of the indicator 17 carried b the bracket 12. A spring 18carried by t e member 19 .on the bracket 12 holds the secondary arm 1ncontact with the plunger and also serves to force the contact, 15 towardthe contact 10. The primary arm 9 is resiliently held with the contact10 in position to engage the work by means of the spring 20 connected atone end to the yoke 7 and at the other end to the pin 21 carried by thebracket 12. A spring-pressed plunger 22 carried .by the standard 5 andadapted to seat in elther of the sockets 23 in the post 3 maintalns thestandard in or out of operative position.

To utilize this gauge, the standard 5 is swung into the position shownin Fig. 1. .AS the standard approaches this position the contacts 10 and15 engage the surface of the work and are forced apart. The spring 18forces the contact 15 into engagement therewith. As the work is reducedby the tool 2, the contacts approach each other and the distance betweenthe contacts is indicated on the dial of the indicator 17. The reducingoperation is continued until the desired condition of the work has beenobtained, after which the standard 5 is swung about the post 3 to removethe contacts from the work. The latter is removed from the spindle and anew piece of` work placed.

It is, of course, understood that the particular device shown anddescribed in the present application illustrates merely a preferred formof construction and arrangement of parts, which, it has been found willsuccessfully carry out the principles of my invention, and variouschanges and modiications of details may be easily made without departingfrom the spirit of my invention as defined in the appended claims.

What I claim is: 1. In a device of the character indicated, a support, astandard rotatably mounted thereon, a primary arm pivotally mounted onsaid standard, a secondary arm rotatably supported by the primary arm,contact members on each arm adapted to engage a piece of work, andresilient means to force said contact members against the work.

2. In a device of the character indicated a support, a standardrotatably mountedthereon, a primary arm pivotally mounted on saidstandard, a bracket carried bysaid primary arm, a secondary armrotatably mounted on said bracket, contact members on each arm adaptedto engage a piece of work, and resilient means to force said contactmembers against said work.

3. In a device of the character indicated, a support, a standard`rotatably mounted thereon, a primary arm pivotally mounted on saidstandard, a bracket carried by said primary arm, a secondary armrotatably mounted on said bracket, contact members on each arm adaptedto engage a piece of work, and resilient members connecting said bracketand secondary arm, and said bracket and primary arm Whereb said contactmembers are forced against the work.

4. In a device of the character indicated, a support, a standardrotatably mounted thereon, a primary arm pivotally mounted on saidstandard, a secondary arm rotatably supported by the primary arm,contact members on each arm adap'ted to en age a piece of work,resilient means to orce said contact members against the work and meansto lock said standard relative to said support. f

5. In a device of the character indicated, a support, a standardrotatably mounted thereon, a primary arm pivotally mounted on saidstandard, a bracket carried by said primary arm, a secondary armrotatably mounted on said bracket, contact members on each arm adaptedto engage a piece of work, resilient means to force said contact membersagainst said work, and means to lock' said standard relative to saidsupport.

6. In a device of the character indicated, a support, a standardrotatably mounted thereon, a primary arm pivotally mounted on saidstandard, a bracket adjustably carried b said primary arm, a secondaryarm l rotata ly mounted on said bracket, contact members on each armadapted to engage a piece of work, reslient members connecting saidbracket and secondary arm, and saidf bracket and primary arm wherebysaid contact members are forced against the work, and means to lock saidstandard relative to said support.

7 In a device of the character described, a primary arm,I a secondaryarm pivotall supported thereby, contact members on eac of said armsadapted to engage a piece of work, means to force said contact membersagainst the work, an indicator supported by said primary arm, and'operatively associated with said secondary arm.

8. In a device of the character a standard, a primary arm pivotallymounted thereon, a secondary arm pivotally suported by said primary arm,contact memrs on each of said arms adapted to engage a piece of work,means to force said contact members a ainst the work, an indicatorsupported y said primary arm and operatively associated with.` saidsecondary arm.

9. In a device of the character indicated,

' a support, a standard movably mounted on said support, a primary armpivotally mounted thereon, a secondary arm pivotally supported by saidprimary arm, contact members on each of said arms adapted to engageapiece of work, means to force said contact members against the Work, anindicator supported by said primary arm and pivoted to said bracket,contact members on each of said arms adapted to engage a piece of Work,means to force said contact members against the Work, an indicator sup;ported by said primary arm and operatively associated with saidsecondary arm.

11. In a device of the character indicated, a support, a standardmovably mounted on said support, a primary arm pivotally mountedthereon, a secondary arm pivotally supported by said primary arm,contact members on each oi said arms adapted to engage a piece of wor-k,means to force said `contact members against the Work, an indicatorsupported by said primary arm and operatively associated With saidsecondary arm, and means to lock said standard'relative to said support.

12. In a device of the character described, a standard, a primary armpivotally mount-l ed thereon, a bracket mounted on said primary arm, asecondary arm pivotally mounted on said bracket, contact members 'oneach of said arms adapted to engage a pieceof Work, an indicatorsupported by said primary1 arm and operatively associated with saidsecondary arm', and resilient members connecting said bracket andsecondary arm and said bracket" and primary arm whereby -said contactmembers are forced against the Work.

13. In a device of the character described, a support, a standardmovably mounted on said support, a primary armivotally mounted thereon,a bracketmoun'ted on said primary arm, a secondary arm pivotally'mounted on said bracket, contact members on each of said arms adapted,to engage a piece of Work, an indicator supported by said primary armand operatively associated with said secondary arm, and resilientmembers connecting said bracket and secondary arm and lsaid bracket andprimary arm whereby said contact members are forced lagainst the Work.

HUGH M. RocKWELL.

